Methods of testing the solidification point of fibres spun from a polymer melt

A mathematical model correlating the position of the solidification point with the change in the thickness of a spun fibre along its length. The calculated data were confirmed experimentally. The spectral range of changes in the fibre thickness as a function of migration of the solidification point caused by pulsation of cooling air expands as the number of filaments increases. For this reason, it is preferable to use the nonuniformity factor for assessing the effect of migration of the solidification point on the properties of a complex fibre. For monofilaments, evaluation of the correlation between migration of the solidification point and the properties of the fibre using the reciprocal correlation coefficient is acceptable and accurate. Methods of monitoring the solidification point of a fibre from a melt are examined, their errors are estimated, and recommendations for use are given.